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Questions tagged [icmpv6]

Internet Control Message Protocol version 6 (ICMPv6) is the implementation of the Internet Control Message Protocol (ICMP) for Internet Protocol version 6 (IPv6). ICMPv6 is defined in RFC 4443. ICMPv6 is an integral part of IPv6 and performs error reporting and diagnostic functions (e.g., ping).

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Advertise a subnet route with radvd

we have set up a small IPv6 Testing network. The setup looks like this: ::/0 +----------+ | Firewall | Router to the public net +----------+ | 2001:...::/106 | +----------+ +-------| SIT GW | sit Tunnel gatway to…
Thomas Berger
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IPv6 - Allow incoming ICMP echo requests

So, we recently got our /48 prefix from our LIR, and started small-scale deploying it in a lab. What struck me as odd is that sites like http://ipv6-test.com/ insist that you allow incoming ICMP Echo requests. I understand why you should allow…
lightxx
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How to nicely make a neighbors discovery solicitation on Linux?

I am looking for a way to retrieve the MAC address of a specific host on a LAN network. I know its IPv6 address. Ideally I would like a way to trigger the Linux Kernel to perform the neighbor solicitation for me, then I could retrieve the host MAC…
djoproject
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Can I filter based on a ICMPv6 subtype?

I'm trying to filter out specific ICMPv6 packets and I tried looking at all the possible types options by using the following command: ip6tables -p icmpv6 -h This yields the following types (note the nested ones): Valid ICMPv6…
Adelin
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IPv6, multiple routers and possible bad prefix advertisement in ICMPv6 RA

I have two 'router' type devices setup on my network. One is my actual IPv6 router - a Cisco 2621 (fe80::xxxx:3e60). It's the correct default router. Another is a DLINK DIR-615 (fe80::xxxx:5760). It's IPv6 aware but at the moment is only configured…
MikeyB
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Almost empty pf.conf still logs packets

I have an issue that my pf logs many packets that it's not supposed to log. I reproduced it with almost empty pf.conf: set skip on lo and it still logs some packets. I think that all those packets have ICMP6 type and they do not really belong to my…
vbezhenar
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How to trigger IPv6 router solicitation on bridge slave port entering RUNNING state?

I have a small Linux system that runs a bridge br0 between its wired eth0 and wireless (AP mode) wlan0 network interfaces. For br0 I have enabled IPv6 (stateless) autoconfiguration; this is actually handled by dhcpcd. Please note that dhcpcd is…
TheDiveO
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Filtering IPv6 ICMPv6 messages

So I'm playing around with IPv6 on my home network a bit more, and I'm doing things a bit old-fashioned -- setting up static addresses and such. This means I don't really want or care for all the automatic configuration built into IPv6 via the…
Kumba
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Multiple routes from router advertisements

Consider the following simplified setup: All devices are IPv6 enabled. Interfaces are configured in a way that we have 3 networks as shown. Router advertisments are enabled on both routers R1 & R2. Because of router advertisemsents, SW2 has now…
AhmedWas
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Is it common for DHCPv6 and RA to provide IPv6 addr in the same subnet?

For IPv6, both DHCP and RA (the "prefix information" option, with the A flag) can provide IPv6 addresses to hosts. I'm still confused if it's common for DHCPv6 and RA to provide IP addresses in the same subnet.
SF.express
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IPv6 PPP Link fails forwarding Router Advertisements into local LAN

A Debian Server having eth0, eth1. eth2, ppp0 devices: 2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether xx:yy:zz:yy:xx:yy brd ff:ff:ff:ff:ff:ff 3: eth1: mtu 1500…
3ronco
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IPv6 radvd with vlans

Is it possible to configure the radvd config so that the router advertisement packets got a VLAN- tag? Theres a switch between my Router (software router, Ubuntu OS) and I only want some VLANs to recieve router advertisements. My switch isn't that…
mushr00mer1990
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Multicast Listener Report Message v2

I run an ICMPv6 protocol and I have made a capture using wireshark. In the capture I have some Multicast Listener Report Message v2. Some of the has the source ip, the ipv6 link local address, but some of them has :: as the source address? Please…
Dragos
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Difference between icmp and icmpv6 for ip6tables?

I found the following lines in a firewall script on one of our Linux servers (kernel 5.x) ip6tables -A INPUT -p icmp -j ACCEPT ip6tables -A INPUT -p ipv6-icmp -j ACCEPT The two commands both run without error, but I'm confused about it. I can only…
iBug
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Dynamic router advertising on IPv6

I have a problem that I'm hoping I can solve with IPv6 but since I haven't had a chance to try it yet I thought I'd propose my solution here. My problem is that we have a LAN with a number of devices that have internal Wifi. All of them are capable…
parsley72
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